Can a 3520 become a 3720?

   / Can a 3520 become a 3720? #1  

rockyridgefarm

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Mar 21, 2002
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Yanmar YT347
Could one add an intercooler to a 3520?
 
   / Can a 3520 become a 3720? #2  
Looks easy enough, but not sure about cost. Injectors have different part # and not sure about pump.
 
   / Can a 3520 become a 3720? #3  
HP is made by adding a more agressive fuel map. The intercooler is used to help keep the EGTs managable from the extra fuel.
If it were an electronic download, I'm sure it would be as simple as adding the intercooler and reprogramming the ECM. But my guess is that Deere uses a mechanical system, thus a new 3720 pump would also be needed.
 
   / Can a 3520 become a 3720? #4  
If anyone knows all the tech info to do this upgrade it would be very intresting, what parts would be needed and what would be the cost??

OK, I know we have some Deere guys in here /forums/images/graemlins/cool.gif
 
   / Can a 3520 become a 3720? #5  
Spend the extra 2K up front. Simple as that.

If you already own a 3520, just be happy with that.
Besides the fact that a 3520 will still be a 3520 at trade in time, your warranty may also be void if you tamper with the fuel system.
 
   / Can a 3520 become a 3720?
  • Thread Starter
#6  
You are right George.

When I posted this I was having a dumb moment (moment?!!)

I was thinking the intercooler gave all the increase. While an intercooler alone would give a small increasde in performance; it is really there to keep the whole system in balance with an increase in fuel delivery.

But still, years down the road it might make sense to make a 3520 int a 3720....
 
   / Can a 3520 become a 3720? #7  
</font><font color="blue" class="small">( But still, years down the road it might make sense to make a 3520 int a 3720....
)</font>



I agree. If the 3520 pump went bad, making a 3720 would be the thing to do..
I just wish my 3720 would come in... /forums/images/graemlins/crazy.gif
It seems to be taking forever to get the thing from Deere.

Anybody else having a long wait for a 3720?
 
   / Can a 3520 become a 3720? #8  
</font><font color="blue" class="small">( HP is made by adding a more agressive fuel map. The intercooler is used to help keep the EGTs managable from the extra fuel.
If it were an electronic download, I'm sure it would be as simple as adding the intercooler and reprogramming the ECM. But my guess is that Deere uses a mechanical system, thus a new 3720 pump would also be needed. )</font>

Pure mechanical system. Pumps can often be physically identical with different settings and part numbers between models. Injectors can affect fuel delivery and be a simple way of getting more power out of same pump config.
 
   / Can a 3520 become a 3720? #9  
Mine was ordered on Tuesday and arrived on Friday! /forums/images/graemlins/shocked.gif
 
   / Can a 3520 become a 3720? #10  
What took so long? /forums/images/graemlins/grin.gif

Maybe with a little luck, I'll see it next week.
 

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